Support for formatting Slovenian

[filips123]

This adds support for formatting Slovenian numbers, dates, times and durations. It seems to work on all examples and tests I tested.

But there is one small problem that nice_duration only supports basic plural form while Slovenian uses many plural forms. I was able to fix this in other functions, but nice_duration relies on plural files (day.word and days.word, etc.), so there will be some wrong plural forms in some cases. However, it should still be understandable for people. I might check how I could fix this in future separate PR (it might require rewriting nice_duration plural support to something that works with more languages).

I will probably also create separate parsing PR in the future.

I have already signed CLA but it is may not be approved yet.

[ChanceNCounter]

nice_duration is one of the trickier functions. For a first pass, I absolutely wouldn't worry about complex cases; the LF team isn't likely to call a language "fully supported" for quite a while after initial work has been done.

After all, the upcoming release is v0.2.3, and a pending refactor will make it 0.3.0 👅 so "slow and steady" is still the name of the game in most languages.

At any rate, LF's a small team, so code review might take a little while. But I can see that you're localizing the right things, in what looks like the right way, and you've had success using the functions, so I'm gonna seize the initiative and give you your Hacktoberfest credit. I imagine @krisgesling will be along to speak to the CLA, and anything else that might need saying from Mycroft-the-company's perspective (I'm not an employee, just a collaborator on this package.)

[krisgesling]

CLA received, and you've been added to our list of excellent humans, thanks!

[ChanceNCounter]

Alright. I've rebased this for compatibility with LF 0.3+

@filips123 if you wouldn't mind checking out that branch (ChanceNCounter/format-slovenian) and ensuring that everything works, you can --force push it on top of this PR branch (I didn't wanna force-push someone else's repo)

It might need some touching up to conform with @JarbasAl's unified formatting and locations, I haven't looked yet. I've just done the basic rebase and integration.

[filips123]

Thanks! I tested it and everything seems to work correctly. I also have an idea how to improve plural support in nice_duration and I will probably create separate PR for this next month (because it will also be useful for other languages).

[ChanceNCounter]

@krisgesling @JarbasAl Now having worked on this PR a little, I'd appreciate another look before it gets merged. Also, it might not be conformant with Jarbas' new layout. The localizer's finding everything, though, so either Jarbas is magic, everything's in the right place, or both.

[JarbasAl]

some nitpicks, but overall looks good

lingua_franca/lang/parse_sl.py is an empty file, can you at least add a comment, TODO implement parsing function

[ChanceNCounter]

It can probably be addressed in another PR, but, at the moment, parse.py has to exist.

If it doesn't, this happens:

>>> from lingua_franca import parse
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/Chance/lingua-franca/lingua_franca/parse.py", line 33, in <module>
    populate_localized_function_dict("parse", langs=get_active_langs())
  File "/Users/Chance/lingua-franca/lingua_franca/internal.py", line 643, in populate_localized_function_dict
    mod = import_module(".lang." + lf_module + "_" + primary_lang_code,
  File "/usr/local/Cellar/[email protected]/3.8.5/Frameworks/Python.framework/Versions/3.8/lib/python3.8/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
ModuleNotFoundError: No module named 'lingua_franca.lang.parse_sl'

whereas, with the empty file,

>>> lingua_franca.set_default_lang("sl")
>>> from lingua_franca import parse
>>> parse.extract_datetime("one")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/Chance/lingua-franca/lingua_franca/internal.py", line 592, in call_localized_function
    return _call_localized_function(func, *args, **kwargs)
  File "/Users/Chance/lingua-franca/lingua_franca/internal.py", line 550, in _call_localized_function
    raise loc_signature
lingua_franca.internal.FunctionNotLocalizedError: This function has not been implemented in the specified language.

Edit: #160 filed to make this unnecessary.

[JarbasAl]

@ChanceNCounter i still think it's good for the file to exist, but with a TODO comment so devs can grep for TODO

but i agree with #160 , should not be mandatory

[ChanceNCounter]

Squashing manually to preserve authorship, then merging